Tube-making apparatus



Nsui 627,205. T Patented lune 20, |899. F.

TUBE MAKIN A PABATus.

V(Application filed' Apts-4, 1899.l

Ow' C www i UNITED STATES .PATENT l OFFICE.

FRED T. REID, OF HARTFORD, CONNECTICUT, ASSIGN OR TO THE POPE MANU- FACTURING COMPANY, OF SAME PLACE AND PORTLAND, MAINE.

SPECIFICATION forming part ef Lettere PatentNo. 627,205, dated Julie 20,1899.-`

Application led April 4, 1899- Serial No. 711,673. (No model.)

l To all whom, it may concern,.-

Be it known that I, FRED T. REID, a citizen of the United States, residing in the city and county of Hartford, in the State of Connecticut, have invented certain new and useful Improvements in Tube-Making Apparatus, of which the following is a specification, reference being had to the accom panyin g drawings,

forming a part thereof.

This invention relates to apparat us for making tubes from hollow ingots in which the ingot passes to grooved rolls over a mandrel which is of necessity held rigidly againstY movement toward the rolls from the position which has been determined to be best for it. In such apparatus the ingot which is passed through between the rolls is commonly received upon another` mandrel, which is held in line with the mandrel rst referred to.Y

It sometimes happens that the mandrel over which the tube is drawn gives way by reason of the breaking of its rod or of the backstop under the severe strain to which it is subjected and is carried with great force against the second mandrel in line with it, causing the rod of the second mandrel to buckle or break and sometimes resulting in the break ing away of a portion of the back-stop which holds the second mandrel. Y

It is the object of this invention to provide means whereby injury to the second mandrel or its rod or back-stop or other part of machine4 shall be prevented,` notwithstanding the carrying away of the first mandrelin the manner referred to. To this end the rod of the second mandrel is so heldin its back-stop as to be capable of yielding in a direction away from the rolls when subjected to un- -usual pressure, although it is heldpositively In said drawings, Figure l is a general view,

partly in side elevation and partly in section, illustrating the application of the invention. Fig. 2 is a front elevation of portions of the rolls shown in Fig. l. Fig. 3 is a longitndi- 55 nal central section of the upper portion of the back-stop shown in Fig. l, with the .mandrel and its rod shown in elevationand partly broken out to save space. Fig. 4 is a view similar to Fig.3,but showing a slightly-differ 6o ent arrangement of the holding devices.

Ordinarygrooved rolls are indicated in a conventional manner atA A in Figs. l and 2, the support thereforbeing also indicated in Fig.l at B. Atasuitable distance from the 65 roll is rigidlyfixed a back-stop C, which is adapted to Vsupport in operative position the mandrel-rod D, which has at its free end the bulb or mandrel d. During operation a second mandrel d is supported by its rod D in 7o line with the first rod and mandrel, the ingot being received upon the one rod and mandrel as it is drawn from the other rod and mandrel.

It is necessary that the mandrels, particularly that one over which the ingot-is drawn, shall vloeiixed rigidly and immovably with relation tothe rolls during the operation, and it is also necessary to provide means for adjusting the position of the mandrel according to the varying conditions of operation. It will be ob- 8o vious that the second or receiving mandrel is .subject to comparatively little pressure under ordinary conditions of operation. It does not require, therefore, to be held positively from movement in a direction away from the roll. Accordingly I have provided means whereby each mandrel shall be held positively from movement toward the rolls and shall be held yieldingly or in such a manner as to be capable of yielding in a direction away from the 9o rolls when subjected to un usual pressure. The `head C' of the back-stop is tubularto receive the mandrel-rod through the same, and the lat` ter may be threaded, as at d, to receive lock nuts d3 and a washer d4 on the side of the 95 back-stop remote from the rolls, so that by the engagement, either direct or indirect,of one of said nuts with the back-stop the mandrel will be held positively frommovement toward the rolls, but with capability of-adjustment. loo To further facilitate the adjustment of the mandrel, the rod may be passed through a sleeve E, which is threaded into the head C .mandrel-rod can be regulated.

`mandrel and rod, and a back-stop, of devices of the back-stop C and is provided With a suitable head e, so that it may be turned readily, and with a lock-nut e. In this case the nut d3 or the Washer d4 above referred to bears against the end of the screw-threaded adjustable sleeve E. As a means to hold the mandrel-rod irmly and yet to permit movement ofthe same in a direction away from the rolls when the receiving-mandrel is subjected to ordinary pressure a splint sleeve or clamping-sleeve F is represented in Fig. 3, having a shoulder f to bear against the side of vthe back-stop toward rolls and having a clamping-bolt f', by means of which the frictional engagement of the sleeve with the It Will be' seen that by such means provision is made for holding the mandrel-rod with sufficient firmness under all ordinary conditions and yet for permitting it to slip through the sleeve Without buckling or doing any other damage wheneveritis subjectedtoanexcessive thrust. In order to provide for a quick clearance of the mandrel-rod in the clamping-sleeve, the diameter ofthe former maybe reduced slightlyfrom a point in frontl of the end of the clamping-sleeve, as at di". As another means of aecomplishing the same purpose the mandrelrod D is shown in Fig. ilas having rigidly secured thereto a sleeve G, While the clampingsleeve F has a tapered end, as at f2, to coni'orm to a tapered seat c, formed in the bore of the tubular head C of the back-stop C. The clamping-sleeve is forced home in its seat and made to grip the sleeve G of the mandrelrod D bythe pressure againstit of the threaded sleeve E. In this case longitudinal adjustment of the mandrel-rod is effected by the .lock-nuts da.

1 It will be readilyv understood that various other embodiments of the invention may be constructed Without Vdeparting from the spirit thereof.

l claim as my invention- I. The combination with rolls, a mandrel and rodfor cooperation Withsaid rolls, a second mandrel and rod on the opposite side of said rolls and in line with the first-named carried by said back-stop to hold the secondnamed rod and mandrel positively from movement toward the rolls, and devices to hold said second-named rod from movement away from said rolls with capacity to slip or yield, substantially as shown and described.

2. The combination with rolls, a mandrel and a rod for cooperation with said rolls, and a back-stop, of devices carried by said backstop to hold said rod and mandrel positively from movement toward the rolls, anda clampin g-'sleeve carried by said back-stop and holding said rod frictionally from movement away from said rolls, substantial-ly as shown and described. v

3. The combination with rolls, a mandrel anda rod for cooperation with said rolls, and a back-stop, of a nut on said rod and engaging said back-stop to hold said rod positively` from movement towardv the rolls, and a clampying-sleeve carried by said baek-stopand holding said rod frictionally from movement away' yfrom said rolls, substantially as shown and described.

i 4. The combination with a mandrel and rod, a second mandrel and rod disposed-opposite to and in line with'thefirst-narned mandrelandrod and a back-stop, of devices en? gaging said back-stop to hold the second- 'named rod positively from movement in one direction and devices engaging said back- ;stop to hold said second-named rod from movement in the opposite direction with capacity to slip or yield, substantially as shown andA described.

5. The combination with a mandrel and 

